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    <title>Document</title>
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  <body>
    <!-- 二进制转十六进制数字, 并解释十六进制的计算原理 -->
    <script>
      let arr = 130
      console.log(arr.toString(2))
      console.log(arr.toString(16)) /*10进制转换成16进制*/
    </script>
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